# Is it Prime? vs isPrime?

The clearest difference is update cadence: isPrime? at every 16 months against Is it Prime?'s every 74 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Is it Prime? ships an update every 74 months, isPrime? every 16 months. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Is it Prime? | isPrime? |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.2 (5 ratings)](https://appshunter.io/ios/app/is-it-prime/id326095651/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 71.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 74 months | **Every 16 months** |
| Monetization | Free | — |
| Size | 1 MB | 4 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Wismar](https://appshunter.io/developer/307757950) | [Omer Faruk Mesebuken](https://appshunter.io/developer/1655501999) |

## What reviewers say

### Is it Prime?

[App page](https://appshunter.io/ios/app/is-it-prime/id326095651)

Enter any number to instantly determine if it is a prime number or not. This straightforward utility provides a quick answer to your mathematical curiosity.

**Highlights:** Prime number identification, Simple number input, Instant yes/no results

**Features:** macOS Compatibility

**In-app purchases:** none


### isPrime?

[App page](https://appshunter.io/ios/app/isprime/id6478832061)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Is it Prime? free?

Is it Prime? is free to download, with no in-app purchases.

### Is isPrime? free?

isPrime? is free to download, with no in-app purchases.

### Do Is it Prime? or isPrime? have ads?

Neither Is it Prime? nor isPrime? shows ads.

### Which is updated more often, Is it Prime? or isPrime??

Is it Prime? ships an update every 74 months, and isPrime? every 16 months. Most recently, Is it Prime? was updated on October 23, 2026 and isPrime? on October 25, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*